Well I am still in my 20s (ahem...late 20's) so I figure that I will spend a lot of money and time making mistakes and collecting rubbish until I can understand much better about keris.
I gather the knowledge from hands on, books, references, forums etc...but the best lesson would be the experiences of paying premium prices for junks...
Still a newcomer like me would always have this kind of problem but the learning curve that i undertaken, for instance thru this forum, would actually saves me a lot of money and time.
I also believe keris can be a good investment, like some of you pointed out. The best investment that came out from keris to me is that it teaches me that history is surprisingly interesting...it's not as boring as when it was in school